Prince William and his new wife Kate Middleton took the U.S. by storm with their visit last week. The Duchess of Cambridge stunned not only with her fashion-forward wardrobe, but also for her skinny frame — as she looks to be shrinking down and losing more weight since her royal nuptials in April.

“Kate looks to weigh from 95 to 100 lbs. That makes her seriously underweight for her height,” Dr. Fred Pescatore, author of The Hamptons Diet, told Star.